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Mr Steinkraus-Koch said the Glock 17 pistol the teen used in his killings had been bought off the notorious Dark Web - where numerous illegal items are bought and sold.

The tragic scene after the shooting (Image: Roland Leon)

Devastated people leave flowers at a memorial (Image: Roland leon)

He added that the gun had its serial number scratched off but appeared to have originated in Slovakia and had been reactivated.

Part of the initial findings from the Bavarian Criminal Police Office found that the 18-year-old German-Iranian could have been plotting his attack for a year after visiting the site of a previous school shooting.